<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.progress</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations-2/#the-progress-of-an-animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';


test(t => {
  const animation = new Animation(null);
  animation.startTime = document.timeline.currentTime;
  assert_time_equals_literal(animation.currentTime, 0, 'currentTime is zero');
  assert_equals(animation.progress, null, 'progress is unresolved');
}, 'progress of a newly created animation without an effect is unresolved');

test(t => {
  // currentTime should be unresolved because the animation has no associated
  // timeline.
  const animation = new Animation(new KeyframeEffect(createDiv(t), null), null);
  assert_equals(animation.currentTime, null, 'currentTime is unresolved');
  assert_equals(animation.progress, null, 'progress is unresolved');
}, 'progress of an animation whose currentTime is unresolved is unresolved.');

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null,
    { duration: 0 }), document.timeline);
  // Set the startTime to 20 seconds into the future.
  animation.startTime = document.timeline.currentTime + 20 * MS_PER_SEC;
  assert_less_than(animation.currentTime, 0, 'currentTime is negative');
  assert_approx_equals(animation.progress, 0, 0.01, 'progress is zero');
}, "progress of an animation whose effect's endTime is zero is zero if its " +
   "currentTime is negative.");

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null,
    { duration: 0 }), document.timeline);
  animation.startTime = document.timeline.currentTime;
  assert_time_equals_literal(animation.currentTime, 0, 'currentTime is zero');
  assert_approx_equals(animation.progress, 1, 0.01, 'progress is one');

  animation.startTime = document.timeline.currentTime - 20 * MS_PER_SEC;
  assert_greater_than(animation.currentTime, 0, 'currentTime greater than zero');
  assert_approx_equals(animation.progress, 1, 0.01, 'progress is one');
}, "progress of an animation whose effect's endTime is zero is one if its " +
   "currentTime is non-negative.");

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null,
    { duration: Infinity }), document.timeline);

  animation.startTime = document.timeline.currentTime - 20 * MS_PER_SEC;
  assert_greater_than(animation.currentTime, 0, 'currentTime is positive');
  assert_approx_equals(animation.progress, 0, 0.01, 'progress is zero');
}, "progress of an animation whose effect's endTime is infinity is zero.");

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null,
    200 * MS_PER_SEC), document.timeline);
  animation.playbackRate = 2;

  animation.startTime = document.timeline.currentTime - 50 * MS_PER_SEC;
  assert_time_equals_literal(animation.currentTime, 100 * MS_PER_SEC, 'currentTime is 100s');
  assert_approx_equals(animation.progress, 0.5, 0.01, 'progress is zero');

  animation.startTime = document.timeline.currentTime - 100 * MS_PER_SEC;
  assert_time_equals_literal(animation.currentTime, 200 * MS_PER_SEC, 'currentTime is 200s');
  assert_approx_equals(animation.progress, 1, 0.01, 'progress is one');

  animation.startTime = document.timeline.currentTime - 150 * MS_PER_SEC;
  assert_time_equals_literal(animation.currentTime, 300 * MS_PER_SEC, 'currentTime is 300s');
  assert_approx_equals(animation.progress, 1, 0.01, 'progress is still one');
}, "progress of an animation is calculated by currentTime / effect endTime.");

</script>
</body>
